bmips: enable CONFIG_B53_MDIO_DRIVER

Some devices have external switches connected by MDIO.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bmips/config-5.10

@@ -4,7 +4,7 @@ CONFIG_ARCH_MMAP_RND_BITS_MAX=15
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=15
 CONFIG_ARCH_SUSPEND_POSSIBLE=y
 CONFIG_B53=y
-# CONFIG_B53_MDIO_DRIVER is not set
+CONFIG_B53_MDIO_DRIVER=y
 CONFIG_B53_MMAP_DRIVER=y
 # CONFIG_B53_SERDES is not set
 CONFIG_B53_SPI_DRIVER=y